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United States Patent | 5,685,089 |
Getler ,   et al. | November 11, 1997 |
A process for spray drying of ceramic suspensions for the production of a powder which is dust free, sufficiently stable for storage and with good flow characteristics. The ceramic suspension is spray dried in a chamber (1) to a powder with a water content which is 0.1-10% higher than required in the final powder and hereafter fluidized in a fluid bed (6) with ambient air for an evaporative cooling process, whereby the water content is reduced to the required value at the same time as the powder is cooled. The produced powder has a high water content without tendency to lumping.
Inventors: | Getler; Jens (Br.o slashed.nsh.o slashed.j, DK); Gibson; Stuart (Attleboro Falls, MA); Fredsted; S.o slashed.ren (Stenl.o slashed.se, DK); Nielsen; Per (Bagsv.ae butted.rd, DK) |
Assignee: | APV Anhydro AS (DK) |
Appl. No.: | 649633 |
Filed: | May 23, 1996 |
PCT Filed: | November 22, 1994 |
PCT NO: | PCT/DK94/00436 |
371 Date: | May 23, 1996 |
102(e) Date: | May 23, 1996 |
PCT PUB.NO.: | WO95/14644 |
PCT PUB. Date: | June 1, 1995 |
Nov 23, 1993[DK] | 1314/93 |
Current U.S. Class: | 34/372; 34/66; 34/89 |
Intern'l Class: | F26B 003/08 |
Field of Search: | 34/337,338,339,340,349,351,363,364,370,372,373,589,65,66,75,76 159/4.3,4.4,DIG. 3 |
3867234 | Feb., 1975 | Smith et al. | 159/4. |
4642904 | Feb., 1987 | Smith, Jr. et al. | 34/349. |
4731937 | Mar., 1988 | Premel et al. | 34/65. |
5044093 | Sep., 1991 | Itoh et al. | 159/DIG. |
5052123 | Oct., 1991 | Tischendorf et al. | 34/65. |
5223088 | Jun., 1993 | Hansen | 34/372. |
Foreign Patent Documents | |||
WO 92/14530 | Sep., 1992 | WO. |